我想創建一個非常基本的map-reduce示例,該示例還在MapReduce api調用中合併了一個查詢。嘗試在MongoDB MapReduce中包含查詢調用
我收藏有很多格式的項目如下:
{ "_id" : { "$binary" : "PdYV4WMTAEyYMQHXJZfzvA==", "$type" : "03" },
"firstname" : "Matthew",
"surname" : "Chambers",
"email" : "" }
的代碼如下:如果
var map = @"
function() {
emit(this.surname, { count : 22 });
}";
var reduce = @"
function(key, emitValues) {
return { count : emitValues[0].count };
}";
List<BsonValue> contactIds = new List<BsonValue>();
contactIds.Add(new Guid("A04FC88D-7BF7-443D-B5C3-EB11EE2B36DF"));
contactIds.Add(new Guid("26B690B3-5ED7-47F4-A878-3906E28BBC58"));
MongoDB.Driver.Builders.QueryConditionList queryList = MongoDB.Driver.Builders.Query.In("_id", BsonArray.Create(contactIds));
//var mr = personCollection.MapReduce(map, reduce);// THIS WORKS!
var mr = personCollection.MapReduce(queryList, map, reduce); // THIS FAILS
的所有作品,我不包括queryList在MapReduce的電話。但是,如果我確實包含queryList,那麼我會得到以下運行時錯誤:
Command 'mapreduce' failed: db assertion failure (response: { "assertion" : "'out' has to be a string or an object", "assertionCode" : 13606, "errmsg" : "db assertion failure", "ok" : 0 }) at MongoDB.Driver.MongoDatabase.RunCommandAs[TCommandResult](IMongoCommand command) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoDatabase.cs:line 621 at MongoDB.Driver.MongoCollection.MapReduce(BsonJavaScript map, BsonJavaScript reduce, IMongoMapReduceOptions options) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCollection.cs:line 788 at MongoDB.Driver.MongoCollection.MapReduce(IMongoQuery query, BsonJavaScript map, BsonJavaScript reduce) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCollection.cs:line 823 at HPSLucene.Models.Mongo.MapReduce() in C:\Inetpub\wwwroot\HPSLucene\HPSLucene\Models\Mongo.cs:line 158
任何人都知道問題是什麼?非常感謝。
您使用的是什麼版本的C#驅動程序? – AdaTheDev 2011-04-05 12:46:49
我在當前驅動程序版本下使用1.0.0.4098 – Journeyman 2011-04-05 12:49:24